package com.demo.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.demo.reggie.comm.BaseContext;
import com.demo.reggie.comm.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/**
 * 检查用户是否登录
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1 本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求: {}", requestURI);

        // 请求白名单
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
        };

        // 2 判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        // 3 不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        ValueOperations operations = redisTemplate.opsForValue();

        // 4-1 判断登录状态
        // Object employee = request.getSession().getAttribute("employee");
        // if (employee != null) {
        //     log.info("用户已登录，用户id为{}", request.getSession().getAttribute("employee"));
        //
        //     Long empId = (Long) request.getSession().getAttribute("employee");
        //     BaseContext.setCurrentId(empId);
        //
        //     filterChain.doFilter(request, response);
        //     return;
        // }
        Long employee = (Long) operations.get("employee");
        if (employee != null) {
            log.info("用户已登录，用户id为{}", operations.get("employee"));
            BaseContext.setCurrentId(employee);
            filterChain.doFilter(request, response);
            return;
        }

        // 4-2 判断登录状态
        // Object user = request.getSession().getAttribute("user");
        // if (user != null) {
        //     log.info("用户已登录，用户id为{}", request.getSession().getAttribute("user"));
        //
        //     Long userId = (Long) request.getSession().getAttribute("user");
        //     BaseContext.setCurrentId(userId);
        //
        //     filterChain.doFilter(request, response);
        //     return;
        // }

        Long user = (Long) operations.get("user");
        if (user != null) {
            log.info("用户已登录，用户id为{}", operations.get("user"));
            BaseContext.setCurrentId(user);
            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        // 5 如果未登录 返回未登录信息
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查请求是否放行
     *
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
